If you get the bricks of just plain coco It is recommended to buffer if it is coco loco , Mother earth you don't have too. I could be wrong but when I grew in coco that is what I read . But you always believe what is on the internet right lmao?
I used to get the bricks now I buy the premixed, it costs a little more but worth it IMO. Maybe buffering helps but I know not buffering doesnt hurt and coco coir grows are pretty damn fast and I have never killed a seedling
